Which process converts light energy into chemical energy?

• A. Cellular respiration
• B. Fermentation
• C. Photosynthesis
• D. Oxidative phosphorylation

Answer: (C)

The conversion of light energy into chemical energy is primarily carried out through photosynthesis. In this process, plants, algae, and some bacteria harness sunlight and utilize it to convert carbon dioxide and water into glucose and oxygen. This occurs mainly in the chloroplasts, where chlorophyll absorbs light energy, initiating a series of reactions known as the light-dependent reactions and the Calvin cycle.

During the light-dependent reactions, photons of light energize electrons, leading to the formation of ATP and NADPH, which store energy. In the following stage, the Calvin cycle uses the ATP and NADPH to fix carbon dioxide into carbohydrates, ultimately producing glucose. Thus, photosynthesis effectively transforms light energy into stored chemical energy in the form of glucose, which can later be utilized by the organism for metabolic processes.

This understanding highlights the unique role of photosynthesis in the energy cycle of ecosystems and its crucial role in providing the organic compounds that serve as the foundation for life on Earth.